US7592563B2 - Method for smoothing and polishing surfaces by treating them with energetic radiation - Google Patents

Method for smoothing and polishing surfaces by treating them with energetic radiation Download PDF

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US7592563B2
US7592563B2 US10/519,146 US51914605A US7592563B2 US 7592563 B2 US7592563 B2 US 7592563B2 US 51914605 A US51914605 A US 51914605A US 7592563 B2 US7592563 B2 US 7592563B2
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remelting
surface
treatment
method according
depth
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US20060081573A1 (en
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Konrad Wissenbach
Edgar Willenborg
Norbert Pirch
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Forderung der Angewandten Forschung eV
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    • CCHEMISTRY; METALLURGY
    • C21METALLURGY OF IRON
    • C21DMODIFYING THE PHYSICAL STRUCTURE OF FERROUS METALS; GENERAL DEVICES FOR HEAT TREATMENT OF FERROUS OR NON-FERROUS METALS OR ALLOYS; MAKING METAL MALLEABLE BY DECARBURISATION, TEMPERING OR OTHER TREATMENTS
    • C21D1/00General methods or devices for heat treatment, e.g. annealing, hardening, quenching or tempering
    • C21D1/06Surface hardening
    • C21D1/09Surface hardening by direct application of electrical or wave energy; by particle radiation
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B23MACHINE TOOLS; METAL-WORKING NOT OTHERWISE PROVIDED FOR
    • B23KSOLDERING OR UNSOLDERING; WELDING; CLADDING OR PLATING BY SOLDERING OR WELDING; CUTTING BY APPLYING HEAT LOCALLY, e.g. FLAME CUTTING; WORKING BY LASER BEAM
    • B23K26/00Working by laser beam, e.g. welding, cutting or boring
    • B23K26/352Working by laser beam, e.g. welding, cutting or boring for surface treatment
    • B23K26/3568Modifying rugosity
    • B23K26/3576Diminishing rugosity, e.g. grinding; Polishing; Smoothing
    • BPERFORMING OPERATIONS; TRANSPORTING
    • B24GRINDING; POLISHING
    • B24BMACHINES, DEVICES, OR PROCESSES FOR GRINDING OR POLISHING; DRESSING OR CONDITIONING OF ABRADING SURFACES; FEEDING OF GRINDING, POLISHING, OR LAPPING AGENTS
    • B24B1/00Processes of grinding or polishing; Use of auxiliary equipment in connection with such processes

Abstract

The present invention relates to a method for smoothing and polishing surfaces by treating them with energetic radiation, in particular laser radiation, in which the to-be-smoothed surface is remelted in a first treatment step using said energetic radiation and employing first treatment parameters at least once down to a first remelting depth of approx. 5 to 100 μm, which is greater than a structural depth of the to-be-smoothed structures of said to-be-smoothed surface, wherein continuous radiation or pulsed radiation with a pulse duration of ≧100 μs is employed. The method makes it possible to automatically polish any three-dimensional surface fast and cost effective.

Description

TECHNICAL FIELD

The present invention relates to a method for smoothing and polishing surfaces by treating them with energetic radiation, in particular laser radiation, in which the to-be-smoothed surface is remelted at least once in a first treatment step, using the energetic radiation and first treatment parameters down to a first remelting depth which is greater than a structural depth of the to-be-smoothed structures of the to-be-smoothed surface and is ≦100 μm. The method can be used, for example, in mechanical engineering for finishing tools and molds. In modern mechanical engineering and, especially, in tool and mold construction, there are high demands on the quality of technical surfaces. However, in manufacturing processes, such as for example milling or eroding, the achievable surface roughness is limited. If smooth, glossy, respectively polished surfaces, are required, additional manufacturing processes, such as abrading and polishing, must follow.

PRIOR ART

Nowadays, tool and mold finishing occurs predominantly by means of manual polishing. Electrically or pneumatically driven devices with up to ultrasonic operating frequencies support the manual work. Until the final polishing step, the steps rough abrasion, fine abrasion and polishing with increasingly finer polishing pastes up to diamond paste must be carried out. Usual polishing times are about 30 min/cm2. Peak-to-valley heights of Ra<0.01 μm are achievable.

Mechanical polishing methods have the drawback that prior art methods cannot be applied or only yield unsatisfactory results if the to-be-polished surfaces have complex three-dimensional geometries.

DE 42 41 527 discloses a method of hardening machine components by heating the surfaces of the component using a laser beam, with which the surface of the machine component can simultaneously be smoothed. In this case, the components are chilled cast parts with a ledeburitic structure or steel parts with a pearlitic structure. In this method, a surface layer of the component is heated using a laser beam until close to the melting point in such a manner that in a boundary layer, diffusion of the carbon occurs out of the cementite lamella of the ledeburite, respectively out of the pearlite, into the soft intermediate ferrite lamella regions. The diffusion of the carbon results in the desired hardening of the surface. Setting the laser parameters with energy densities in the range of 103-105 W/cm2 results, moreover, in marked evaporation and melting of a thin surface skin, which simultaneously leads to micro-smoothing of the surface. This application requires the laser power of approximately 4-12 kw.

Furthermore, EP 0 819 036 B1 describes a method using a laser to polish with any three-dimensional mold surface in which the contour of the to-be-treated workpiece is first measured and then the treatment strategy and the treatment parameters are derived from the prescribed desired shape and the current shape. Smoothing and polishing are realized by a removal process. For laser polishing, a region of low laser intensity is proposed as greater material removal is not desired in this application. However, there is no other mention in this printed publication of treatment strategies or treatment parameters for achieving an optimum degree of smoothing. The heart of the proposed method is recognizing any deviation of the current shape from the desired shape by scanning using a three-dimensional contour measuring device. From this deviation, the suited treatment parameters are calculated and utilized. These steps are repeated until the desired shape is obtained. However, the required use of a three-dimensional contour measuring device is complicated and, due to the precision demanded, connected with very high costs.

DE 197 06 833 A1 discloses a method for smoothing and polishing surfaces according to the generic part of claim 1. In this method, the surface is brought to start to briefly melt with pulsed laser radiation having a pulse duration of between 10 ns and 10 μs to a depth of 2 to 3 μm with each laser pulse. The new molten mass generated with each laser pulse solidifies again before the next laser pulse occurs. However, the method is only suited for smoothing surfaces with a minimal surface roughness of Rz≦3 μm.

The object of the present invention is to provide a method for smoothing and polishing surfaces by treating them with energetic radiation, in particular laser radiation, and this method does not require expensive measuring instruments and can be used to automatically polish any three-dimensional surface, in particular metal surfaces, quickly and inexpensively.

DESCRIPTION OF THE INVENTION

The object on which the present invention is based is solved using the method according to claim 1. Advantageous embodiments of the methods are the subject matter of the subordinate claims or can be drawn from the following description and the preferred embodiments.

In the present method for smoothing, respectively polishing, surfaces by treating them with energetic radiation, for example laser radiation or electron radiation, the to-be-smoothed surface is remelted in a first treatment step using the energetic radiation and employing the first treatment parameters at least once down to a first remelting depth of approximately 5 to 100 μm, which is greater than a structural depth of the to-be-smoothed structure of the to-be-smoothed surface, using continuous radiation or pulsed radiation with a pulse duration of ≧100 μs.

Preferably a second treatment step is conducted then utilizing energetic radiation with second treatment parameters. In this second treatment step, the micro-roughness remaining after the first treatment step is leveled by remelting down to a second remelting depth, which is less deep than the first remelting depth, and by evaporating roughness peaks. This preferred embodiment of the present method is thus based on a multi-step treatment process, which can be divided into rough treatment and fine treatment. In the first treatment step, also referred to in the following as rough treatment, the to-be-smoothed surface is remelted once or multiple times down to a first remelting depth in a boundary layer using the energetic radiation and employing the first treatment parameters. In this remelting process, the macro-roughness which, for example may stem from previous milling, respectively eroding process, is removed. In a second treatment step, also referred to in the following as fine treatment, the remaining micro-roughness on the surface is then leveled using energetic radiation and employing the second treatment parameters. The second treatment step of the fine treatment comprises therefore a combination material removal and remelting process in which the thickness of the remelted boundary layer is less than the thickness of the remelted boundary layer of the first treatment step.

With the proposed method, any three-dimensional workpiece surface can be quickly and inexpensively automatically polished. Measuring the contour of the to-be-polished surface is not required. Moreover, due to the multi-step treatment process with different first and second treatment parameters, a high glossiness of the polished surface is achieved.

The method is particularly suited for smoothing three-dimensional metal surfaces. For example, it has already been used to smooth and polish workpieces made of the steels 1.2343, 1.2767 and 1.2311 as well as of titanium materials. Of course, the present method can also be utilized with other metals and non-metals such as, for example, workpieces made of plastic. Someone skilled in the art needs only to adapt the treatment parameters to the to-be-treated materials in order to obtain the conditions for the first treatment step and, if need be, for the second treatment step. The first treatment parameters are preferably selected in such a manner that no ablation of material or only a smallest possible ablation of material occurs, since smoothing is effected in this first treatment solely by remelting of the boundary layer down to the first remelting depth. In smoothing and polishing plastics, conducting just the first step suffices to obtain excellent smoothing results.

By utilizing continuous or pulsed energetic radiation, in particular laser radiation, with a great pulse duration of ≧100 μs single or multiple remelting of the boundary layer down to the first remelting is achieved. In contrast to this, in the second treatment step, pulsed radiation with a pulse duration of ≦5 μs is preferably employed to generate the high intensities required for the combination remelting and material removal process. In this second treatment step, the surface is preferably only remelted down to a second remelting depth of maximally 5 μm, whereas the greater first remelting depth of the first treatment step preferably lies between 10 and 80 μm. This first remelting depth of the first treatment step is dependent on the size of the macro-roughness of the to-be-smoothed workpiece. The greater the to-be-smoothed macro-roughness, the greater the depth of the first remelting depth has be selected in order to achieve sufficient leveling of the macro-roughness.

Furthermore, smoothing and polishing of the surface with energetic radiation should be conducted under a protective gas shroud. This may occur by treatment within a process chamber filled with protective gas or by feeding the protective gas to the surface areas being treated by means of a jet. Argon, helium or nitrogen can, for example, be used as the protective gas.

Optimum smoothing results are yielded with the present method, if the surface of the workpiece is remelted multiple times in succession in the first treatment step, preferably with a first remelting depth that decreases from remelting process to remelting process. The treatment with energetic radiation is, as in the second treatment step, conducted in a prior art manner by scanning the surface with the energetic beam. This scanning occurs in parallel paths, with the individual paths defined by the width of the single energetic beams partially overlapping. In the multiple remelting of the surface, the treatment direction is preferably turned by an angle of, for example, 90° between the single remelting processes in such a manner that the paths of successive remelting processes lie perpendicular to each other.

BRIEF DESCRIPTION OF THE DRAWINGS

The present method is made more apparent in the following using a preferred embodiment with reference to the accompanying drawings without the intention of limiting the scope or spirit of the inventive idea. The file of this patent contains at least one drawing/photograph executed in color. Copies of this patent with color drawing(s)/photograph(s) will be provided by the Office upon request and payment of the necessary fee.

FIG. 1 a shows a schematic sketch of the scanning of the to-be-smoothed surface using a laser beam and FIG. 1 b shows an example of a cross-section of the laser beam;

FIG. 2 shows a rather schematic representation of an example of an original profile of a surface including the results of various polishing concepts;

FIG. 3 shows a comparison of surface profiles of an unprocessed milled surface with a surface profile of the surface of following the first treatment step of the present method;

FIG. 4 shows an example of the treatment strategy for successive processing a multiplicity of adjacent treatment sections;

FIG. 5 shows an example of the treatment strategy for retaining edges on the to-be-smoothed surface;

FIG. 6 shows a schematic representation of an example of the different remelting depths of the first and second treatment steps of the present method;

FIG. 7 shows a representation comparing the measured surface profile following the first and following the second treatment step;

FIG. 8 shows a photographic representation of a surface before smoothing using the present method following the first treatment step and following the second treatment step; and

FIG. 9 a and FIG. 9 b shows an example of smoothing a surface using the present method while retaining structures of significance.

WAYS TO CARRYING OUT THE INVENTION

FIG. 1 a shows very schematically the treatment process in the present method by scanning the surface 1 of the to-be-treated workpiece 2 with a laser beam 3. The laser beam 3 is led in parallel paths 6, preferably meandering, over a section 4 of the to-be-treated surface 1. The width 5 (track width) of the individual paths 6 is given by the diameter 7 of the laser beam on the surface 1. In order to obtain a suited intensity or track width, this beam diameter 7 may, of course, be adapted with the aid of a interconnected optic. The laser beam 3 is led over the surface 1 in the direction indicated by the arrow with a given scanning velocity. Adjacent paths 6 overlap by selecting a track offset 8 which is smaller than the track width 7. The length 9 of the individual paths 6 can be predefined. It is, however, limited by the laser scanning system employed. Therefore, in order to treat large surface areas, a multiplicity of shown sections 4 have to be treated successively. FIG. 1 also, indicates, by way of example a first remelting depth 10 down to which the workpiece 2 is remelted in the first treatment step of the present method. In addition to a round beam cross section, another beam cross section 7 a, for example rectangular respectively linear can, of course, also be employed as is indicated by way of example in FIG. 1 b.

In this first treatment step, a continuous or pulsed laser system with pulse lengths of >0.1 ms is utilized. The boundary layer of the workpiece 2 is melted just so deep that the roughness present on surface 1 is smoothed. This first remelting depth 10 is adapted to the original roughness. Typical first remelting depths 10 lie in the range between 10 and 100 μm. The greater the unevenness of the original surface 1, the deeper the remelting has to be in order to permit the necessary volume compensation. For example, greater first remelting depths are required for milled surfaces than for abraded surfaces. Using a continuous laser beam, respectively a pulsed laser beam with long pulse lengths, prevents evaporation of material from the surface 1 in this rough treatment of the first treatment step, permitting thereby carrying out the polishing process with substantially less energy than is the case with applications in which the macro-roughness is removed. Furthermore, local overheating in the molten bath which leads to material removal and to undesired molten bath movements and thus to deteriorating the surface roughness is largely prevented.

For this first treatment step of the present method, the beam source is preferably a Nd:YAG laser, a CO2 laser, a diode laser or an electron beam source. The laser power lies in the range from 40-4000 W. The beam diameter being 100-1000 μm, the scanning velocity is approximately 30-300 mm/s and the track offset is selected between 10 to 400 μm. The interaction times with the surface lie preferably between 200 μs and 10 ms. Passing surface 1, respectively the section 4 just undergoing treatment, multiple times and turning the treatment direction by, for example, 90° permits improving the first treatment step further.

FIG. 2 shows, as an example, in a very schematic representation a section of an abstracted original profile (FIG. 2 a) of a to-be-treated surface with macro-roughness with a height 11 of 10 μm and a width of, respectively a distance 12 of 300 μm (not shown to scale). These measures correspond to typical original dimensions of the original roughness of a surface with a milling structure.

FIG. 2 c shows the effect of the first treatment step of the present method in which the surface (previously: broken line; after: continuous line) is remelted to a remelting depth of approximately 10 μm. Remelting the material in this remelting step levels the macro-roughness.

In comparison, FIG. 2 b shows a result as obtained by flat removal of surface material in polishing. This example clearly shows that the macro-roughness cannot be completely removed by flat removal (20: areas of removed material).

FIG. 3 finally shows measured surface profiles of a to-be-treated, respectively treated, surface. FIG. 3 a shows a measured profile of an untreated, milled surface where the macro-roughness is clearly visible. Following carrying out the first treatment step of the present method, a profile of this surface is obtained, as depicted in FIG. 3 b. This figure clearly shows definite smoothing of the macro-roughness after the first treatment step.

In the case of large to-be-smoothed surfaces, a multiplicity of sections 4 of surface 1 depicted in FIG. 1 have to be treated successively with laser radiation. In order that the boundaries, respectively the beginning of the respective adjacent section (4) are not visible on the finished workpiece, the treatment parameters are continuously changed, respectively changed in steps, down to the border of these sections 4 in such a manner that the first remelting depth is reduced. FIG. 4 shows in a section an example of such a type of treatment strategy. In this section, two treated sections 4 are adjacent to each other. In the transition region between the two sections 4, the remelting depth 10 is continuously reduced in such a manner that there are no abrupt changes in smoothing in this transition region. Changing the treatment parameters down to the border of section 4 can be achieved by defocusing the laser beam, by reducing the power, for example using power ramps, by increasing the feed rate, for example using feed rate ramps, or by varying the position of the beginning, end, or turning points.

In polishing injection mold tools, it is essential that the edge at the separation plane of the tool is not rounded, because this would lead to undesired formation of crests on the plastic parts produced with the tool. In order to prevent rounding at the to-be-retained edges of the surface of the tool, a similar strategy can be used in carrying out the present method as in successively processing adjacent treatment sections. The treatment parameters are changed toward the edge in such a manner that the first remelting depth decreases. The edge itself must not be remelted as this would always lead to rounding it. FIG. 5 shows that of the two sections of surface 1 adjacent at edge 13, the first remelting depth 10 decreases toward edge 13 so that no remelting occurs at the edge 13 itself. This reduction of the remelting depth can be achieved by decreasing the laser power, respectively increasing the feed rate toward the edge 13.

After smoothing the surface in the first treatment step, the degree of gloss is raised in a second treatment step using a pulsed laser with pulse lengths of <1 μs. By selecting a second remelting depth 14, which is less than the first remelting depth 10, a very thin boundary layer of <5 μm is remelted and the remaining micro-roughness peaks 15 are removed by evaporating the material. This is depicted very schematically in FIG. 6 showing the first remelting depth 10 and the second remelting depth 14 as well as the remaining micro-roughness peaks 15 remaining after the first treatment step. A glossy surface is obtained with this second treatment step.

FIG. 7 shows a measured profile of a surface smoothed using the present method. Depicted in the left part of the figure is the surface roughness remaining after the first treatment step, and depicted in the right part of the figure is the surface profile after the second treatment step. In this representation, the reduction in the thickness of the line indicates the substantial reduction of the micro-roughness to a magnitude of ≦0.1 μm remaining after the first treatment step.

Treatment in the second treatment step also occurs by scanning the surface, for example on a meandering path. Typical treatment parameters for the second treatment step are the use of a Nd:YAG laser or an excimer laser with a laser power of 5-200 W and a scanning velocity of 300-3000 mm/s with a beam diameter of 50-500 μm and a track offset of 10-200 μm.

Finally, FIG. 8 is a photograph of a surface showing a region 16 following milling, a region 17 following the first treatment step and a region 18 following the second treatment step. The glossy surface yielded by the second treatment step is quite evident in this figure compared to the smoothing of the first step, respectively compared to the unsmoothed surface.

With suited selection of the treatment parameters, surfaces can also be polished in such a manner that the structures of significance present in a surface are retained, undesired micro-roughness, however, is removed. By selecting the treatment parameters, in particular the first remelting depth, it can be set which structure of the surface are smoothed and which are to remain. Thus, for example, an eroded surface can be polished to a high gloss while retaining the erosion structure and in this way producing grained surfaces for injection mold tools, as is shown, for example, in FIG. 9 a and FIG. 9 b. FIG. 9 a shows an eroded, unpolished surface with corresponding structures of significance 19 and micro-roughness 15. FIG. 9 b shows the same eroded surface after smoothing according to the present method. It is clearly visible that the micro-structures have been completely removed and but that the structures of significance 19 are still present. Changing the treatment parameters during treatment results in varyingly strongly smoothed structures, and in this way different gray hues can be realized, for example for creating inscriptions on a surface.

LIST OF REFERENCES

  • 1 surface
  • 2 workpiece
  • 3 laser beam
  • 4 section of the surface, resp. treatment field
  • 5 track width
  • 6 path
  • 7 beam diameter
  • 7 a beam cross section
  • 8 track off set
  • 9 path length
  • 10 first remelting depth
  • 11 height of the macro-roughness
  • 12 width of, resp. distance, the macro-roughness
  • 13 edge
  • 14 second remelting depth
  • 15 micro-roughness
  • 16 untreated area
  • 17 treated area after the first treatment step
  • 18 treated area after the second treatment step
  • 19 structures of significance
  • 20 removed material

Claims (15)

1. A method for smoothing and polishing a to-be-smoothed surface, comprising:
a first treatment step comprising remelting the to-be-smoothed surface using energetic radiation while employing first treatment parameters at least once down to a first remelting depth which is greater than a structural depth of to-be-smoothed structures of said to-be-smoothed surface, wherein the using of energetic radiation includes using continuous energetic radiation or pulsed energetic radiation with a pulse duration of ≧100 μs, such that said surface is remelted down to a first remelting depth of about 5 to 100 μm, and
a second treatment step comprising leveling micro-roughness remaining on said surface after said first treatment step by remelting the micro-roughness using said energetic radiation while employing second treatment parameters down to a second remelting depth, and by evaporating roughness peaks, wherein the second remelting depth is less than said first remelting depth.
2. A method according to claim 1, including selecting said first treatment parameters so that no ablation of material occurs.
3. A method according to claim 1, wherein the using step includes using pulsed laser radiation with a pulse duration of ≦1 μs is employed in said second treatment step.
4. A method according to claim 1, wherein the remelting step includes remelting said surface in said first treatment step down to a first remelting depth of approximately 10 to 80 μm.
5. A method according to claim 1, wherein the remelting of said surface in said second treatment step includes remelting said surface down to a second remelting depth of maximally 5 μm.
6. A method according to claim 1, wherein the remelting step includes remelting said surface in said first treatment step multiple times in succession.
7. A method according to claim 6, wherein with each new remelting step, selecting said first remelting depth less deep than in the previous remelting step.
8. A method according to claim 6, wherein the remelting step includes leading said energetic radiation in parallel paths over said surface with successive remelting steps of a section of said surface being carried out with paths turned at an angle.
9. A method according to claim 1, wherein treatment in said first treatment step occurs successively in a multiplicity of adjacent sections of said surface, with the treatment parameters being changed continuously or in steps towards a border of said sections in such a manner that said first remelting depth decreases to said border of said sections.
10. A method according to claim 1, wherein in order to retain edges on said surface, said first treatment parameters of said first treatment step are changed continuously or in steps in such a manner that said first remelting depth decreases toward said edges.
11. A method according to claim 1, wherein the remelting step includes leading said energetic radiation on one or a multiplicity of meandering paths over said surface.
12. A method according to claim 1, including impinging said surface with protective gas during said first and said second treatment steps.
13. A method according to claim 1, wherein treatment occurs with a beam cross section in form of a line or with a rectangular beam cross section of said energetic radiation.
14. A method according to claim 1, further comprising preheating said to-be-smoothed surface before remelting.
15. A method according to claim 1, including selecting said first treatment parameters so that structures of significance of said to-be-smoothed surface are retained during remelting.
US10/519,146 2002-06-27 2003-06-24 Method for smoothing and polishing surfaces by treating them with energetic radiation Expired - Fee Related US7592563B2 (en)

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Publication number Priority date Publication date Assignee Title
DE10342750B4 (en) * 2003-09-16 2008-06-19 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. A method for smoothing and polishing, or for structuring surfaces with laser radiation
US8653409B1 (en) * 2004-06-23 2014-02-18 Board Of Governors For Higher Education, State Of Rhode Island And Providence Plantations Selective surface smoothing using lasers
DE102005020072B4 (en) * 2005-04-22 2007-12-06 Forschungsverbund Berlin E.V. A method for fine polishing / -strukturieren heat-sensitive dielectric materials by means of laser radiation
DE102005026968B4 (en) * 2005-06-10 2007-06-14 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Method for permanently a gray scale image on a matte surface coating
WO2007018117A1 (en) * 2005-08-05 2007-02-15 Yuzo Mori Electron beam assisted eem method
DE102005044424A1 (en) * 2005-09-16 2007-04-05 Blanco Gmbh + Co Kg A method for producing a weld seam
JP4939098B2 (en) * 2006-04-05 2012-05-23 三菱重工業株式会社 Residual stress improving method and the residual stress improving apparatus tubular body
DE102006043774A1 (en) * 2006-09-14 2008-03-27 Fachhochschule Jena Production of molding inserts from glass, ceramic or glass-ceramic comprises producing preform, forming molding surface on it by addition or removal of material; and finishing it using laser beam
EP1939488A1 (en) * 2006-12-28 2008-07-02 Robert Bosch Gmbh Method for processing a metal band, a continuous metal band and pushbelt in which the metal band is used
DE102007020748A1 (en) 2007-05-03 2008-11-13 Clean-Lasersysteme Gmbh Apparatus and method for processing a surface of a workpiece using laser radiation
US8536054B2 (en) * 2008-01-18 2013-09-17 Miasole Laser polishing of a solar cell substrate
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DE102017208616A1 (en) * 2017-05-22 2018-11-22 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e. V. A method for reducing the frictional sliding against each other and / or rolling surfaces

Citations (29)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015100A (en) * 1974-01-07 1977-03-29 Avco Everett Research Laboratory, Inc. Surface modification
US4100393A (en) * 1977-02-08 1978-07-11 Luther Ronald B Method for making a cannula using a laser and the cannula made thereby
US4122240A (en) * 1976-02-17 1978-10-24 United Technologies Corporation Skin melting
US4229232A (en) * 1978-12-11 1980-10-21 Spire Corporation Method involving pulsed beam processing of metallic and dielectric materials
US4299860A (en) * 1980-09-08 1981-11-10 The United States Of America As Represented By The Secretary Of The Navy Surface hardening by particle injection into laser melted surface
US4401726A (en) * 1974-01-07 1983-08-30 Avco Everett Research Laboratory, Inc. Metal surface modification
US4447275A (en) * 1981-01-28 1984-05-08 Nippon Piston Ring Co., Ltd. Cylinder liner
US4451299A (en) * 1982-09-22 1984-05-29 United Technologies Corporation High temperature coatings by surface melting
US4455893A (en) * 1980-11-06 1984-06-26 Optik Innovation Ab Oiab Method in producing a mould for a lens
US4698237A (en) * 1985-01-04 1987-10-06 Rolls-Royce Plc Metal surface hardening by carbide formation
US4731516A (en) * 1985-10-11 1988-03-15 Mitsubishi Denki Kabushiki Kaisha Laser polishing semiconductor wafer
US4832798A (en) * 1987-12-16 1989-05-23 Amp Incorporated Method and apparatus for plating composite
US4968383A (en) * 1985-06-18 1990-11-06 The Dow Chemical Company Method for molding over a preform
US5068514A (en) * 1988-10-25 1991-11-26 Bausch & Lomb Incorporated Laser polishing of lens surface
US5072092A (en) * 1989-09-28 1991-12-10 General Motors Corporation Excimer laser treatment of engine bearing surfaces such as cylinders
US5232674A (en) * 1989-12-20 1993-08-03 Fujitsu Limited Method of improving surface morphology of laser irradiated surface
EP0601451A1 (en) 1992-12-10 1994-06-15 Adam Opel Ag Process for hardness increasing and possibly for smoothing of work pieces and work pieces made by this process
DE4320408A1 (en) 1993-06-21 1994-12-22 Fraunhofer Ges Forschung Process-control method for the surface machining of workpieces with pulsed laser radiation
WO1996031315A1 (en) 1995-04-06 1996-10-10 Polierwerkstatt Für Stahlformen Bestenlehrer Gmbh Process and device for laser machining of any 3d surface
US5601737A (en) * 1993-07-27 1997-02-11 Matsushita Electric Works, Ltd. Surface treating process involving energy beam irradiation onto multilayered conductor parts of printed circuit board
DE19706833A1 (en) 1997-02-21 1998-09-03 Audi Ag Producing cylinder running surfaces in piston machinery
US5900170A (en) * 1995-05-01 1999-05-04 United Technologies Corporation Containerless method of producing crack free metallic articles by energy beam deposition with reduced power density
US5997377A (en) * 1995-11-17 1999-12-07 Hoya Corporation Process for the production of spacered substrate for use in self-emitting display
JP2000285737A (en) * 1999-03-30 2000-10-13 Hoya Corp Transparent conductive thin film and its manufacture
US6143587A (en) * 1997-11-28 2000-11-07 Kabushiki Kaisha Toshiba Method of marking on semiconductor device having metallic layer
WO2002030328A1 (en) 2000-10-12 2002-04-18 Boston Scientific Limited Laser polishing of medical devices
US6552302B2 (en) * 1999-04-02 2003-04-22 Fujitsu Limited Method for correcting surface shape of magnetic head slider and magnetic head slider
US6612204B1 (en) * 1999-07-09 2003-09-02 Zwilling J.A. Henckels Atiengesellschaft Process for manufacturing a blade of a cutting tool and product manufactured therewith
US6670575B1 (en) * 1998-09-30 2003-12-30 Lasertec Gmbh Method and apparatus for removing substance from the surface of a workpiece

Patent Citations (35)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4015100A (en) * 1974-01-07 1977-03-29 Avco Everett Research Laboratory, Inc. Surface modification
US4401726A (en) * 1974-01-07 1983-08-30 Avco Everett Research Laboratory, Inc. Metal surface modification
US4122240A (en) * 1976-02-17 1978-10-24 United Technologies Corporation Skin melting
US4100393A (en) * 1977-02-08 1978-07-11 Luther Ronald B Method for making a cannula using a laser and the cannula made thereby
US4229232A (en) * 1978-12-11 1980-10-21 Spire Corporation Method involving pulsed beam processing of metallic and dielectric materials
US4299860A (en) * 1980-09-08 1981-11-10 The United States Of America As Represented By The Secretary Of The Navy Surface hardening by particle injection into laser melted surface
US4455893A (en) * 1980-11-06 1984-06-26 Optik Innovation Ab Oiab Method in producing a mould for a lens
US4447275A (en) * 1981-01-28 1984-05-08 Nippon Piston Ring Co., Ltd. Cylinder liner
US4451299A (en) * 1982-09-22 1984-05-29 United Technologies Corporation High temperature coatings by surface melting
US4698237A (en) * 1985-01-04 1987-10-06 Rolls-Royce Plc Metal surface hardening by carbide formation
US4968383A (en) * 1985-06-18 1990-11-06 The Dow Chemical Company Method for molding over a preform
US4731516A (en) * 1985-10-11 1988-03-15 Mitsubishi Denki Kabushiki Kaisha Laser polishing semiconductor wafer
US4832798A (en) * 1987-12-16 1989-05-23 Amp Incorporated Method and apparatus for plating composite
US5068514A (en) * 1988-10-25 1991-11-26 Bausch & Lomb Incorporated Laser polishing of lens surface
US5072092A (en) * 1989-09-28 1991-12-10 General Motors Corporation Excimer laser treatment of engine bearing surfaces such as cylinders
US5232674A (en) * 1989-12-20 1993-08-03 Fujitsu Limited Method of improving surface morphology of laser irradiated surface
EP0601451A1 (en) 1992-12-10 1994-06-15 Adam Opel Ag Process for hardness increasing and possibly for smoothing of work pieces and work pieces made by this process
DE4241527A1 (en) 1992-12-10 1994-06-16 Opel Adam Ag Carburization process and optionally smoothing machine components and machine parts produced by this method
DE4320408A1 (en) 1993-06-21 1994-12-22 Fraunhofer Ges Forschung Process-control method for the surface machining of workpieces with pulsed laser radiation
US5601737A (en) * 1993-07-27 1997-02-11 Matsushita Electric Works, Ltd. Surface treating process involving energy beam irradiation onto multilayered conductor parts of printed circuit board
US6043452A (en) * 1995-04-06 2000-03-28 Polierwerkstatt Fuer Stahlformen Bestenlehrer Gmbh Method and device for processing arbitrary 3D shaped surfaces by means of a laser, in particular for polishing and texturing workpieces, and for producing sealing surfaces on dies
WO1996031315A1 (en) 1995-04-06 1996-10-10 Polierwerkstatt Für Stahlformen Bestenlehrer Gmbh Process and device for laser machining of any 3d surface
EP0819036A1 (en) 1995-04-06 1998-01-21 Polierwerkstatt Für Stahlformen Bestenlehrer GmbH Process and device for laser machining of any 3d surface
US5900170A (en) * 1995-05-01 1999-05-04 United Technologies Corporation Containerless method of producing crack free metallic articles by energy beam deposition with reduced power density
US6103402A (en) * 1995-05-01 2000-08-15 United Technologies Corporation Crack free metallic articles
US5997377A (en) * 1995-11-17 1999-12-07 Hoya Corporation Process for the production of spacered substrate for use in self-emitting display
DE19706833A1 (en) 1997-02-21 1998-09-03 Audi Ag Producing cylinder running surfaces in piston machinery
US6143587A (en) * 1997-11-28 2000-11-07 Kabushiki Kaisha Toshiba Method of marking on semiconductor device having metallic layer
US6400037B1 (en) * 1997-11-28 2002-06-04 Kabushiki Kaisha Toshiba Method of marking on metallic layer, metallic layer with marks thereon and semiconductor device having the metallic layer
US6670575B1 (en) * 1998-09-30 2003-12-30 Lasertec Gmbh Method and apparatus for removing substance from the surface of a workpiece
JP2000285737A (en) * 1999-03-30 2000-10-13 Hoya Corp Transparent conductive thin film and its manufacture
US6552302B2 (en) * 1999-04-02 2003-04-22 Fujitsu Limited Method for correcting surface shape of magnetic head slider and magnetic head slider
US6612204B1 (en) * 1999-07-09 2003-09-02 Zwilling J.A. Henckels Atiengesellschaft Process for manufacturing a blade of a cutting tool and product manufactured therewith
WO2002030328A1 (en) 2000-10-12 2002-04-18 Boston Scientific Limited Laser polishing of medical devices
US6492615B1 (en) * 2000-10-12 2002-12-10 Scimed Life Systems, Inc. Laser polishing of medical devices

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
K. Sridhar et al., Naval Materials Research Laboratory, "Formation of Highly Corrsion Resistant Stainless Steel Surface Alloys for Marine Environments by Laser Surface Alloying," Corrosion 1998, pp. 705/1-705-14. . . .

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US20080289958A1 (en) * 2007-04-27 2008-11-27 Janine Kardokus Novel Manufacturing Design and Processing Methods and Apparatus for Sputtering Targets
US9279178B2 (en) * 2007-04-27 2016-03-08 Honeywell International Inc. Manufacturing design and processing methods and apparatus for sputtering targets
US10191348B2 (en) 2010-07-08 2019-01-29 Gentex Corporation Electro-optic element
US9056584B2 (en) 2010-07-08 2015-06-16 Gentex Corporation Rearview assembly for a vehicle
US9701248B2 (en) 2010-07-08 2017-07-11 Gentex Corporation Rearview assembly for a vehicle
US10209556B2 (en) 2010-07-26 2019-02-19 E Ink Corporation Method, apparatus and system for forming filter elements on display substrates
US9316347B2 (en) 2012-01-24 2016-04-19 Gentex Corporation Rearview assembly with interchangeable rearward viewing device
US9505349B2 (en) 2012-04-24 2016-11-29 Gentex Corporation Display mirror assembly
US8864322B2 (en) 2012-08-24 2014-10-21 Gentex Corporation Shaped rearview mirror assembly
US9434312B2 (en) 2012-08-24 2016-09-06 Gentex Corporation Shaped rearview mirror assembly
US9327648B2 (en) 2013-01-04 2016-05-03 Gentex Corporation Rearview assembly with exposed carrier plate
US9488892B2 (en) 2013-01-09 2016-11-08 Gentex Corporation Printed appliqué and method thereof
US10126624B2 (en) 2013-01-09 2018-11-13 Gentex Corporation Printed appliqué and method thereof
US10286487B2 (en) 2013-02-28 2019-05-14 Ipg Photonics Corporation Laser system and method for processing sapphire
US10018843B2 (en) 2013-09-24 2018-07-10 Gentex Corporation Display mirror assembly
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US9956646B2 (en) 2014-02-28 2018-05-01 Ipg Photonics Corporation Multiple-beam laser processing using multiple laser beams with distinct wavelengths and/or pulse durations
US9764427B2 (en) 2014-02-28 2017-09-19 Ipg Photonics Corporation Multi-laser system and method for cutting and post-cut processing hard dielectric materials
US9694751B2 (en) 2014-09-19 2017-07-04 Gentex Corporation Rearview assembly
US9694752B2 (en) 2014-11-07 2017-07-04 Gentex Corporation Full display mirror actuator
US10071689B2 (en) 2014-11-13 2018-09-11 Gentex Corporation Rearview mirror system with a display
US10131279B2 (en) 2014-12-03 2018-11-20 Gentex Corporation Display mirror assembly with an RF shield bezel
USD783480S1 (en) 2014-12-05 2017-04-11 Gentex Corporation Rearview device
US9995854B2 (en) 2015-04-20 2018-06-12 Gentex Corporation Rearview assembly with applique
US10112540B2 (en) 2015-05-18 2018-10-30 Gentex Corporation Full display rearview device
US9994156B2 (en) 2015-10-30 2018-06-12 Gentex Corporation Rearview device
WO2017123995A1 (en) * 2016-01-14 2017-07-20 Arconic Inc. Methods for producing forged products and other worked products
CN108472712A (en) * 2016-01-14 2018-08-31 奥科宁克公司 Methods for producing forged products and other worked products
USD845851S1 (en) 2016-03-31 2019-04-16 Gentex Corporation Rearview device
USD817238S1 (en) 2016-04-29 2018-05-08 Gentex Corporation Rearview device
US10025138B2 (en) 2016-06-06 2018-07-17 Gentex Corporation Illuminating display with light gathering structure
USD809984S1 (en) 2016-12-07 2018-02-13 Gentex Corporation Rearview assembly

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